CN103178258B - Alumina-coated is modified the preparation method of lithium nickel cobalt manganese oxygen positive electrode - Google Patents
Alumina-coated is modified the preparation method of lithium nickel cobalt manganese oxygen positive electrode Download PDFInfo
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Abstract
A kind of alumina-coated is modified the preparation method of lithium nickel cobalt manganese oxygen positive electrode, and it includes:1) presoma is prepared：Water-soluble metal nickel salt, cobalt salt and manganese salt are made into mixed solution, the simultaneously pH value and reaction temperature of control system is added drop-wise in reaction vessel together with precipitating reagent, pattern controlling agent, through filtering, washing and be dried in vacuo after reaction, obtains presoma (NixCoyMn1‑x‑y)(OH)2, wherein, 0<x<1,0<y<1, and 0<x+y<1；2) presoma of alumina-coated is prepared：By (NixCoyMn1‑x‑y)(OH)2Presoma, water-soluble aluminum salt and equal powder are scattered in deionized water, and warming while stirring to equal powder hydrolyzes, and is filtrated to get Al (OH)3(the Ni of claddingxCoyMn1‑x‑y)(OH)2Presoma, it is placed in sintering kiln roasting and obtains Al2O3(the Ni of claddingxCoyMn1‑x‑y)(OH)2Precursor powder；3) by Al2O3(the Ni of claddingxCoyMn1‑x‑y)(OH)2Precursor powder uniformly mixes with lithium salts powder, and the alumina-coated that high-temperature calcination obtains layered crystal structure is modified Li (NixCoyMn1‑x‑y)O2Positive electrode.
Description
Technical field
The invention belongs to field of lithium ion battery, it is more particularly related to which a kind of alumina-coated is modified lithium nickel
The preparation method of cobalt manganese-oxygen-lithium ion battery positive electrode.
Background technology
By long-term fast-developing, lithium ion battery has achieved a series of rapid progresses, it is considered to be electric automobile is most
One of potential energy source.But because short life, abuse bad adaptability, high expensive be present in current lithium ion battery
Etc. a series of shortcomings, the electric automobile using lithium ion battery as power source commercially not yet obtains extensive success.
Ganines and Cuenca (L.Gaines and R.Cuenca, Cost of Lithium Ion Batteries
For Vehicles, U.S.Department of Energy, 2000.) pointed out by calculating：In lithium ion battery, positive pole material
The cost of material only accounts for 15-20%, substitutes cost caused by rich cobalt-based material to reduce with rich Mn-based material extremely limited.Therefore,
By improving the ratio energy of lithium ion battery, the life-span for extending battery is only the more effective method for being more easy to realize to reduce cost.
The ternary material LiNi of layer structure1/3Co1/3Mn1/3O2Because discharge capacity is high, has a safety feature, Stability Analysis of Structures
The good, low cost and other advantages of property, it is considered to be the optimal selection as the anode material for lithium-ion batteries in electric automobile energy source
One of.But due to the poor circulation under high voltage, LiNi1/3Co1/3Mn1/3O2Application be restricted.With no electricity
Chemically active oxide is to LiNi1/3Co1/3Mn1/3O2Its chemical property, SUN etc. can be significantly improved by carrying out surface modification
People (SUN Y K, HAN J M, MYUNG S T, LEE S W, AMINE K.Electrochem.Commun., 2006,8:821-
826.SUN Y K,CHO S W,LEE S W,YOON C S,AMINE K.J.Electrochem.Soc,2007,154:A168-
A172. research) has shown that, by Al2O3It is coated on LiNi1/3Co1/3Mn1/3O2The surface of material, can be with electrolyte cyclic process
In caused HF reacted and as catch and consume HF material, reduce HF generation, significantly improve material and followed in high pressure
Dissolving during ring, improve its circulation volume holding capacity.
CN201110222410.7 and 201110222398.X discloses a kind of lithium ion cell positive for coating aluminium respectively
The preparation method of material, still, hydroxyl of the coprecipitation method provided in CN201110222410.7 near feed points and
Aluminum ions concentration is high, and aluminium hydroxide can be generated largely moment near feed points, and aluminium hydroxide can not be ensured in matrix surface
Homogeneous precipitation.CN201110222398.X is coated using organic silicon source, and toxicity is larger, and aluminium isopropoxide is difficult in isopropanol
To be configured to an even solution for higher concentration, the usage amount of isopropanol is increased, cost substantially increases, and is not suitable for extensive life
Production.
In view of this, it is modified lithium nickel cobalt manganese oxygen lithium ion cell positive it is necessory to provide a kind of new alumina-coated
The preparation method of material.
The content of the invention
It is an object of the invention to：A kind of new alumina-coated is provided and is modified lithium nickel cobalt manganese oxygen lithium ion cell positive
The preparation method of material.
In order to realize foregoing invention purpose, the invention provides a kind of alumina-coated to be modified lithium nickel cobalt manganese oxygen positive electrode
Preparation method, it comprises the following steps:
1) water-soluble metal nickel salt, cobalt salt and manganese salt are made into mixed solution, obtain metal ion solution；By metal ion
Stir and heat in the reactor that solution adds nitrogen atmosphere together with precipitating reagent, pattern controlling agent, the pH value of control system and
Temperature, obtain d50=8-10 μm of spherical precursor (NixCoyMn1-x-y)(OH)2Precipitation；By (NixCoyMn1-x-y)(OH)2Particle
Product filtering, wash and be dried in vacuo, wherein, 0<x<1,0<y<1, and 0<x+y<1；
2) by (NixCoyMn1-x-y)(OH)2Presoma, water-soluble aluminum salt and equal powder are dispersed in by certain mol ratio
In ionized water, warming while stirring to equal powder hydrolyzes, and is filtrated to get Al (OH)3The presoma of cladding；Cladding powder is placed in
The sintering kiln roasting of air atmosphere obtains Al2O3The precursor powder of cladding；And
3) by Al2O3The precursor powder of cladding uniformly mixes in proportion with lithium salts powder, obtains mixed-powder；Will mixing
Powder is placed in the sintering furnace of air atmosphere, by certain heating schedule in 800-1000 DEG C of activation, you can obtain layered crystal
Li (the Ni of the oxidation of precursor aluminium coating modification of structurexCoyMn1-x-y)O2Positive electrode.
It is modified a kind of of the preparation method of lithium nickel cobalt manganese oxygen positive electrode as alumina-coated of the present invention to improve, 1/3≤x
≤ 4/5,1/10≤y≤1/3.
It is modified a kind of of the preparation method of lithium nickel cobalt manganese oxygen positive electrode as alumina-coated of the present invention to improve, x=1/
3, y=1/3, or x=0.5, y=0.2, or x=0.4, y=0.4, or x=0.8, y=0.1, or x=0.4, y=0.2.
It is modified a kind of of the preparation method of lithium nickel cobalt manganese oxygen positive electrode as alumina-coated of the present invention to improve, step 1)
In, soluble metal nickel salt, cobalt salt and the manganese salt are corresponding sulfate, nitrate, acetate, chlorate or its combination；
The precipitating reagent is sodium hydroxide solution, potassium hydroxide solution, lithium hydroxide solution or its combination；The pattern controlling agent is ammonia
Water, ammonium chloride, urea, ammonium hydrogen carbonate or its combination.
It is modified a kind of of the preparation method of lithium nickel cobalt manganese oxygen positive electrode as alumina-coated of the present invention to improve, step 1)
In, the soluble metal nickel salt, cobalt salt, the concentration of manganese salt mixed solution are 0.2-3.5M, preferably 0.5-1.0M；Mix molten
In liquid, nickel, cobalt, the mol ratio of manganese are 1:1:1 or 5:2:3 or 4:4:2 or 8:1:1, preferably 1:1:1；The precipitant concentration
For 1-10M, preferably 4-6M；It is 0.5-10M, preferably 4-6M that the pattern, which controls agent concentration,；PH value is 10.0-12.0, preferably
10.5-11.0；Reaction temperature is 25 DEG C -75 DEG C, preferably 50-60 DEG C.
It is modified a kind of of the preparation method of lithium nickel cobalt manganese oxygen positive electrode as alumina-coated of the present invention to improve, step 2)
In, the water-soluble aluminum salt is aluminum nitrate solution, aluminum sulfate solution, aluminium acetate solution, liquor alumini chloridi or its combination；The water
The concentration of dissolubility aluminum salt solution is 0.001-1.0M, preferably 0.01-0.1M；The powder is urea, ammonium hydrogen carbonate, ammonium chloride
Or its combination.
It is modified a kind of of the preparation method of lithium nickel cobalt manganese oxygen positive electrode as alumina-coated of the present invention to improve, step 2)
In, the presoma NixCoyMn1-x-y)(OH)2, aluminium element, the mass ratio of equal powder in aluminium salt be presoma:Al:Equal powder
=100：0.01-2.0：0.167-33.4, preferably 100：0.1-1.0：1.67-16.7.
It is modified a kind of of the preparation method of lithium nickel cobalt manganese oxygen positive electrode as alumina-coated of the present invention to improve, step 2)
In, the presoma NixCoyMn1-x-y)(OH)2, water-soluble aluminum salt, the pH value of equal powder mixing water dispersion soln be 3.5-5.5,
Preferable ph is 3.8-4.5；The hydrolysis temperature of the powder is 70-100 DEG C, preferably 80-90 DEG C.
It is modified a kind of of the preparation method of lithium nickel cobalt manganese oxygen positive electrode as alumina-coated of the present invention to improve, step 2)
In, the sintering temperature is 400-600 DEG C, preferably 450-550 DEG C.
It is modified a kind of of the preparation method of lithium nickel cobalt manganese oxygen positive electrode as alumina-coated of the present invention to improve, step 3)
In, the lithium salts is one kind in lithium carbonate, lithium hydroxide, lithium acetate；The molal quantity and presoma of lithium ion in the lithium salts
The mol ratio of middle metal nickel cobalt manganese molal quantity summation is Li+：(Ni2++Co2++Mn2+)=1.01-1.10：1, preferably 1.02-
1.05：1.
Relative to prior art, alumina-coated of the present invention be modified lithium nickel cobalt manganese oxygen positive electrode preparation method have with
Lower advantage：
First, the present invention is silicon source from water-soluble aluminum salt, and equal powder makees precipitating reagent, by the slow water for controlling equal powder
Solution adjusts COH -/CAl 3+Ratio, make Al (OH)3Presoma surface is homogeneously precipitated in, then the fired surface that obtains uniformly is wrapped
It is covered with Al2O3The presoma of layer.Through Al2O3(the Ni of claddingxCoyMn1-x-y)(OH)2Presoma is in mixed lithium calcination activation into Li
(NixCoyMn1-x-y)O2Afterwards, a part of aluminium atom can be doped to Li (NixCoyMn1-x-y)O2Play stable crystal structure in inside
Effect, suppress material the oxygen release during cycle of higher pressure the occurrence of, another part aluminium atom then bag in the form of aluminum oxide
Overlay on material surface and play a part of hydrofluoric acid depleting agents, to reduce corrosion of the hydrofluoric acid to material, hold not reducing material gram
Material cyclical stability at higher voltages and cycle life are improved on the premise of amount.
Secondly, aluminium ion and the equal powder of precipitating reagent are disperseed in the form of homogeneous solution, therefore the generation of aluminium hydroxide
Synchronously carried out in whole solution, and speed hydroxy is more directly added dropwise in powder decomposition offer speed hydroxy
It is slow, it can effectively suppress the reunion of the aluminium hydroxide of generation, clad is uniform.
In addition, the preparation method of alumina-coated modification lithium nickel cobalt manganese oxygen positive electrode of the present invention is easy to operate, step is simple
List, production cost are low and non-toxic, can significantly improve LiNixCoyMn1-x-yO2The surface stability of material under high pressure, improve
Its cycle performance and security performance under high pressure.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, lithium nickel cobalt manganese oxygen positive electrode is modified to alumina-coated of the present invention
Preparation method is further described, wherein：
Fig. 1 is the scanning electron microscope (SEM) photograph of the presoma of uncoated aluminum oxide made from the embodiment of the present invention 2.
Fig. 2 is the scanning electron microscope (SEM) photograph of the presoma of coated aluminum oxide made from the embodiment of the present invention 2.
Fig. 3 is the ICP result figures of the presoma of coated aluminum oxide made from the embodiment of the present invention 2.
Fig. 4 is the height of the anode material of lithium battery of oxidation of precursor aluminium cladding made from the embodiment of the present invention 2 and comparative example 1
Press cycle performance curve comparison figure.
Embodiment
In order that goal of the invention, technical scheme and the technique effect of the present invention become apparent from, below in conjunction with implementation column and attached
The present invention is described in further detail in figure, it will be understood that embodiments of the invention are not only for explaining the present invention
The limitation present invention, embodiments of the invention also and are confined to the embodiment that is provided in specification.
Hereinafter, using molecular formula as Li (Ni1/3Co1/3Mn1/3)O2Positive electrode exemplified by, with the following Examples to this hair
It is bright to be described further, but the positive electrode of the present invention is not limited to following examples.
Comparative example 1
1) molecular formula Li (Ni are pressed1/3Co1/3Mn1/3)O2The ratio of middle transition metal prepares NiSO4、CoSO4、MnSO4It is mixed
Heshui solution, cation concn 2mo1/L；
2) mixed solution in step 1) and 2mol/L NaOH solutions, 3mol/L ammonia spirits are added drop-wise to reaction jointly
In container, control system pH value is 11.0, and heating water bath is to 50 DEG C.After reacting 12h, filtering, washing, in 120 DEG C of drying boxes
Presoma (Ni is obtained after drying 8h1/3Co1/3Mn1/3)(OH)2；
3) powder and 40.76gLi for obtaining step 2)2CO3Powder mixing is placed in the sintering furnace of air atmosphere, is first existed
500 DEG C of 5 hours of heating, then heat to 900 DEG C and sinter 20 hours in atmosphere, obtain the Li of layered crystal structure
(Ni1/3Co1/3Mn1/3)O2Granular product；
4) Li (Ni obtained by step 3) are weighed1/3Co1/3Mn1/3)O2Positive electrode 50g, it is placed in 200ml ethanol solutions and divides
Dissipate, the mass fraction that aluminium isopropoxide is weighed by 0.5wt% covering amount is 0.5wt% aqueous isopropanol 384.6g, is added to
In the alcohol dispersion liquid of above-mentioned positive electrode, flowed back 1h, filters, and obtained solid is placed in into 500 DEG C of calcining 5h in Muffle furnace, obtained
To Li (Ni1/3Co1/3Mn1/3)O2The positive electrode of surface alumina oxide cladding.
Embodiment 1
1) molecular formula Li (Ni are pressed1/3Co1/3Mn1/3)O2The ratio of middle transition metal prepares NiSO4、CoSO4、MnSO4It is mixed
Heshui solution, cation concn 2mo1/L；
2) mixed solution in step 1) and 2mol/L NaOH solutions, 3mol/L ammonia spirits are added drop-wise to reaction jointly
In container, control system pH value is 11.0, and heating water bath is to 50 DEG C.After reacting 12h, filtering, washing, 120 DEG C of vacuum drying 8h
After obtain presoma (Ni1/3Co1/3Mn1/3)(OH)2；
3) by presoma (Ni1/3Co1/3Mn1/3)(OH)2, nine water aluminum nitrates and equal powder urea presoma in molar ratio：Al：
Urea=100：0.5：It is molten that 8.35 ratio weighs 50g presomas, the water aluminum nitrates of 3.67g nine and the equal powder urea of 5.35g respectively
Solution is dispersed with stirring uniformly in 250mL deionized waters；
4) dispersion soln obtained by step 3) is warming up to 70 DEG C, stirring keeps 1h, is filtrated to get Al (OH)3Before cladding
Drive body；
5) cladding powder that step 4) obtains is placed in the sintering furnace of air atmosphere the roasting 5h at 500 DEG C and obtains Al2O3
The precursor powder 50g of cladding；
6) powder and 40.76gLi for obtaining step 5)2CO3Powder mixing is placed in the sintering furnace of air atmosphere, is first existed
500 DEG C of heating 5h, then heat to 900 DEG C and sinter 20h in atmosphere, obtain the alumina-coated modification of layered crystal structure
Li(Ni1/3Co1/3Mn1/3)O2Granular product.
Using the front and rear form of scanning electron microscopic observation oxidation of precursor aluminium cladding, covering amount is determined with ICP.
Embodiment 2-5
The step of the step of embodiment 2-5 is with embodiment 1 is essentially identical, unlike, in embodiment 2-5 step 3)
In, forerunner's weight, aluminium salt, aluminium salt concentration, presoma：Aluminium element：Equal powder mol ratio, alumina-coated ratio such as following table institute
Show：
Fig. 1 and Fig. 2 is respectively the front and rear form of the oxidation of precursor aluminium of embodiment 2 cladding, it can be seen that of the invention
The uniformity of embodiment coated aluminum oxide is fine；Fig. 3 show the presoma of coated aluminum oxide made from the embodiment of the present invention 2
ICP result figures, it can be seen that the aluminium content of cladding of the embodiment of the present invention up is consistent with design flow, show the cladding
The practicality of method is preferable.
Chemical property is analyzed
By the positive electrode for synthesizing to obtain in comparative example 1 and embodiment 1-5 respectively with conductive carbon, binding agent Kynoar
(PVDF) in mass ratio 90：5：5 mix in 1-METHYLPYRROLIDONE (NMP) solvent, 12h are stirred under normal temperature, scraper for coating exists
Thickness is on 16 μm of Al paper tinsel collectors, 120 DEG C of vacuum drying 12h, is cold-pressed backlash into a diameter of 14.0mm disk positive pole；It is negative
Pole uses a diameter of 15.0mm metal lithium sheet；Electrolyte uses 1mol/L LiPF6, EC/EMC=3:7(V/V)；Using poly- third
Alkene (PP) barrier film, assembled in glove box and obtain CR2430 button cells, to mutually powered-down on LAND button cell testers
Chemical property is tested.
Constant-current charge, charge cutoff voltage 4.45V, 4.45V constant-voltage charge to electricity are carried out with 50mA/g current density
Current density is 2mA/g, then with 50mA/g current density constant-current discharge to 3.0V, is circulated by above-mentioned flow button type battery
Test, obtain synthesizing the cycle performance of each positive electrode.Fig. 4 gives comparative example 1 and embodiment 1-5 circulation volume curve,
It can be seen from figure 4 that the aluminium isopropoxide method for hydrolysis Surface coating Al of comparative example 12O3Li (Ni1/3Co1/3Mn1/3O2Performance
Go out faster capacity attenuation, and embodiment 1-5 shows good cyclical stability.
The detailed description of the embodiment of the present invention is understood with reference to more than, relative to prior art, alumina-coated of the present invention
The preparation method of modified lithium nickel cobalt manganese oxygen positive electrode has advantages below：
First, the present invention is silicon source from water-soluble aluminum salt, and equal powder makees precipitating reagent, by the slow water for controlling equal powder
Solution adjusts COH -/CAl 3+Ratio, make Al (OH)3Presoma surface is homogeneously precipitated in, then the fired surface that obtains uniformly is wrapped
It is covered with Al2O3The presoma of layer.Through Al2O3(the Ni of claddingxCoyMn1-x-y)(OH)2Presoma is in mixed lithium calcination activation into Li
(NixCoyMn1-x-y)O2Afterwards, a part of aluminium atom can be doped to Li (NixCoyMn1-x-y)O2Play stable crystal structure in inside
Effect, suppress material the oxygen release during cycle of higher pressure the occurrence of, another part aluminium atom then bag in the form of aluminum oxide
Overlay on material surface and play a part of hydrofluoric acid depleting agents, to reduce corrosion of the hydrofluoric acid to material, hold not reducing material gram
Material cyclical stability at higher voltages and cycle life are improved on the premise of amount.
Secondly, aluminium ion and the equal powder of precipitating reagent are disperseed in the form of homogeneous solution, therefore the generation of aluminium hydroxide
Synchronously carried out in whole solution, and speed hydroxy is more directly added dropwise in powder decomposition offer speed hydroxy
It is slow, it can effectively suppress the reunion of the aluminium hydroxide of generation, clad is uniform.
In addition, the preparation method of alumina-coated modification lithium nickel cobalt manganese oxygen positive electrode of the present invention is easy to operate, step is simple
List, production cost are low and non-toxic, can significantly improve LiNixCoyMn1-x-yO2The surface stability of material under high pressure, improve
Its cycle performance and security performance under high pressure.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula carries out appropriate change and modification.Therefore, the invention is not limited in embodiment disclosed and described above, to this
Some modifications and changes of invention should also be as falling into the scope of the claims of the present invention.In addition, although this specification
In used some specific terms, but these terms are merely for convenience of description, do not form any restrictions to the present invention.
Claims (16)
1. a kind of alumina-coated is modified the preparation method of lithium nickel cobalt manganese oxygen positive electrode, it is characterised in that comprises the following steps:
1) presoma is prepared：Water-soluble metal nickel salt, cobalt salt and manganese salt are made into mixed solution, then with precipitating reagent, pattern control
Preparation is added drop-wise in reaction vessel the simultaneously pH value and reaction temperature of control system together, through filtering, washing after reaction certain time
And vacuum drying, obtain presoma (NixCoyMn1-x-y)(OH)2, wherein, 0<x<1,0<y<1, and 0<x+y<1；
2) presoma of alumina-coated is prepared：By (NixCoyMn1-x-y)(OH)2Presoma, water-soluble aluminum salt and equal powder press one
It is scattered in deionized water to determine mol ratio, warming while stirring to equal powder hydrolyzes, and is filtrated to get Al (OH)3Cladding
(NixCoyMn1-x-y)(OH)2Presoma, the sintering kiln roasting for being subsequently placed in air atmosphere obtain Al2O3Cladding
(NixCoyMn1-x-y)(OH)2Precursor powder；And
3) by Al2O3(the Ni of claddingxCoyMn1-x-y)(OH)2Precursor powder uniformly mixes by a certain percentage with lithium salts powder, high
The alumina-coated that temperature calcining obtains layered crystal structure is modified Li (NixCoyMn1-x-y)O2Positive electrode.
2. preparation method according to claim 1, it is characterised in that 1/3≤x≤4/5,1/10≤y≤1/3, and 0<x+y
<1。
3. preparation method according to claim 1, it is characterised in that x=1/3, y=1/3, or x=0.5, y=0.2, or
X=0.4, y=0.4, or x=0.8, y=0.1, or x=0.4, y=0.2.
4. preparation method according to claim 1, it is characterised in that in step 1), the soluble metal nickel salt, cobalt salt
It is corresponding sulfate, nitrate, acetate, chlorate or its combination with manganese salt；The precipitating reagent is sodium hydroxide solution, hydrogen
Potassium oxide solution, lithium hydroxide solution or its combination；The pattern controlling agent be ammoniacal liquor, ammonium chloride, urea, ammonium hydrogen carbonate or its
Combination.
5. preparation method according to claim 4, it is characterised in that in step 1), the soluble metal nickel salt, cobalt
Salt, the concentration of manganese salt mixed solution are 0.2-3.5M；In mixed solution, nickel, cobalt, the mol ratio of manganese are 1:1:1 or 5:2:3 or 4:
4:2 or 8:1:1；The precipitant concentration is 1-10M；It is 0.5-10M that the pattern, which controls agent concentration,；PH value is 10.0-12.0；
Reaction temperature is 25 DEG C -75 DEG C.
6. preparation method according to claim 4, it is characterised in that in step 1), the soluble metal nickel salt, cobalt
Salt, the concentration of manganese salt mixed solution are 0.5-1.0M；In mixed solution, nickel, cobalt, the mol ratio of manganese are 1:1:1；The precipitating reagent
Concentration is 4-6M；It is 4-6M that the pattern, which controls agent concentration,；PH value is 10.5-11.0；Reaction temperature is 50-60 DEG C.
7. preparation method according to claim 1, it is characterised in that in step 2), the water-soluble aluminum salt is aluminum nitrate
Solution, aluminum sulfate solution, aluminium acetate solution, liquor alumini chloridi or its combination；The concentration of the aqueous aluminum salt solution is
0.001-1.0M；The powder is urea, ammonium hydrogen carbonate, ammonium chloride or its combination.
8. preparation method according to claim 7, it is characterised in that in step 2), the aqueous aluminum salt solution it is dense
Spend for 0.01-0.1M.
9. preparation method according to claim 1, it is characterised in that in step 2), the presoma (NixCoyMn1-x-y)
(OH)2, aluminium element, the mass ratio of equal powder in aluminium salt be presoma:Al:Equal powder=100：0.01-2.0：0.167-
33.4。
10. preparation method according to claim 9, it is characterised in that in step 2), the presoma (NixCoyMn1-x-y)
(OH)2, aluminium element, the mass ratio of equal powder in aluminium salt be presoma:Al:Equal powder=100：0.1-1.0：1.67-16.7.
11. preparation method according to claim 1, it is characterised in that in step 2), the presoma (NixCoyMn1-x-y)
(OH)2, water-soluble aluminum salt, the pH value of equal powder mixing water dispersion soln be 3.5-5.5；The hydrolysis temperature of powder is
70-100℃。
12. preparation method according to claim 11, it is characterised in that in step 2), the presoma
(NixCoyMn1-x-y)(OH)2, water-soluble aluminum salt, the pH value of equal powder mixing water dispersion soln be 3.8-4.5；The powder
Hydrolysis temperature is 80-90 DEG C.
13. preparation method according to claim 1, it is characterised in that in step 2), the sintering temperature is 400-600
℃。
14. preparation method according to claim 13, it is characterised in that in step 2), the sintering temperature is 450-550
℃。
15. preparation method according to claim 1, it is characterised in that in step 3), the lithium salts is lithium carbonate, hydrogen-oxygen
Change one kind in lithium, lithium acetate；Metal nickel cobalt manganese molal quantity summation in the molal quantity and presoma of lithium ion in the lithium salts
Mol ratio is Li+：(Ni2++Co2++Mn2+)=1.01-1.10：1.
16. preparation method according to claim 15, it is characterised in that in step 3), lithium ion rubs in the lithium salts
That number and the mol ratio of metal nickel cobalt manganese molal quantity summation in presoma are Li+：(Ni2++Co2++Mn2+)=1.02-1.05：1.
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| CN114455644A (en) * | 2020-12-31 | 2022-05-10 | 北京当升材料科技股份有限公司 | Lithium ion battery anode material, preparation method and application thereof, system and precursor preparation device |
| CN112909233B (en) * | 2021-05-08 | 2021-07-16 | 浙江帕瓦新能源股份有限公司 | Coating modification method of ternary material precursor |
| CN113571694B (en) * | 2021-07-30 | 2023-03-24 | 浙江帕瓦新能源股份有限公司 | Multi-ion modified ternary material precursor and preparation method of anode material |
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